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Hong-Ou-Mandel interference between independent III-V on silicon waveguide integrated lasers.

C Agnesi, B Da Lio, D Cozzolino

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    Researchers integrated III-V lasers on silicon for quantum applications. They observed Hong-Ou-Mandel interference between weak-coherent pulses, a key step for secure quantum key distribution (QKD) systems.

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    Area of Science:

    • Quantum Photonics
    • Integrated Optics
    • Quantum Information Science

    Background:

    • Silicon photonic integrated circuits are versatile for quantum applications like quantum key distribution (QKD).
    • Integrating high-repetition-rate photon sources on silicon remains a challenge.
    • Weak-coherent pulses (WCPs) offer a potential solution for QKD, particularly for measurement device independent QKD (MDI-QKD).

    Purpose of the Study:

    • To demonstrate the feasibility of integrating III-V lasers on silicon waveguides for quantum photonics.
    • To experimentally observe quantum interference effects crucial for advanced QKD protocols.
    • To advance the development of fully silicon-integrated QKD systems.

    Main Methods:

    • Fabrication of III-V on silicon waveguide integrated lasers.
    • Generation of weak-coherent pulses (WCPs) from two independent lasers.
    • Experimental observation and measurement of Hong-Ou-Mandel interference visibility.

    Main Results:

    • Successful integration of III-V lasers on silicon waveguides.
    • Experimental observation of Hong-Ou-Mandel interference between WCPs from independent lasers.
    • Achieved interference visibility of 46±2%.

    Conclusions:

    • The integration of III-V on silicon lasers is a promising approach for on-chip quantum photonics.
    • The observed Hong-Ou-Mandel interference is a critical step towards silicon-integrated MDI-QKD.
    • This work paves the way for fully integrated QKD systems and other quantum communication protocols.